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glatten tatr' @anni @ffice GEORGE H. CLARKE, OF BROOKLYN, ASSIGNOR TO THE SALAMANDER GRATE-BAR COMPANY, OE NEW YORK, N. Y. i

Letters Patent No. 73,436, elated January 21, 18,68.

GRATE-BARS FOR'IURNAGES'.

TO ALL 'WHOM IT MAY CONCERN:A

Beit known that I, GEORGE H. CLARKE, of Erooklyn, in the county of Kings, and State of New York, have invented certain newy and useful Improvements in Grate-Bars for Furnaces; and I do hereby declare the following to he a full, clear,.and exact description of thesame, reference being had to the accompanying drawings, gures, and letters of reference thereon, making part of this specification. Of the said drawings- Figure 1 represents a side view of the bar. I Y

Figure 2, a perspective view of two of the bars joined together by tho connections.

Figure 3, a sectional view through line my, g. Il. 1

Similar letters of reference indicate like parts in all the.drawings.

My invention is an improvement upon vthe patent granted,l to Samuel Vansyckel, October 19, 1855, and which is now owned by the Salamander Grate-Bar Company of New York city, and to whom my invention has been duly assigned.

`:[n'the use of the Vansyckel bar, as it is called, much difficulty is experienced when it becomes necessary to remove a. broken or defective har; the system of interlacing being such that all the bars, commencing at the one which was laid last, originally, must be removedin order to reach the defective bar, no matter whereit may be located in the furnace. In large furnaces this-proves a serious objection.

My improvement completely obviates this diiculty, and enables vme to remove a'bnr' wherever it may be located inV the furnace, very quickly, and without-disturbing the rest of the bars.

To enable others skilled inthe art to make and use this, my invention, I willV proceed to describe the construction and Operation thereof'. I i

i A represents a bar, cast with lugs or projections, aat b, ou-one side, and with the projections ec on'thc opposite side, and with a recess, C, on the ond, as plaiulyshown in figs. 1 and 2. The projections a a, tting into the mortises formed on the side of the bar by the projections c c, serve to interlock and support the bars i firmly in the centre, and the projections b support the ends ofthe bars ono uponthc other. In`the ends of vthe bars A, I cast a mortise orrecess, O, into which a key-rod, B, fits, which extends the width of the furnace, and by means of which the bars are locked and held in place. By'removing this key-rod B, and sliding a bar forward, the distance equal to the thickness of the projections, it can be readily lifted out and removed from any part of the furnace, and a new one inserted with-but little loss of time.

Claim. I claim the arrangement of the locking-rod B and recess C, in combination 'with the interlocking-bar A, the whole constructed and operating as set forth and specified.

GEORGE H. CLARKE.

Witnesses:

C. A. DURGIN, J ORN McNALLY. 

